Disk-sharpener.



PATENTED JAN. 9, 1906.

C. M. STRAIN.

DISK SHARPENER.

APPLICATION FILED APR.1'7, 1905.

2 SHEETS-SHEET 1.

' Z0 ml. WWW I PATENTED JAN. 9, 1906.

0. M. STRAIN.

DISK SHARPENBR.

APPLICATION FILED 3.17, 1905.

2 SHEETS-SHEET 2.

.w a u b C Whwoau GNITED PATENT OFFICE.

CHARLES H. STRAIN, OF (JRAWFORDSVILLE, IOWA, ASSIGNOR OF ONE- THIRD TODAVIDSON BROS, OF GRAWFORDSVILLE, IOWVA.

DlSK-SHARPENER.

Specification of Letters Patent.

Patented Jan. 9, 1906.

Application filed April 17, 19051 Serial No. 256,098.

To a whom it may concern:

Be it known that 1, CHARLES M. STRAIN, a citizen of the United States,residing at Crawfordsville, in the county of lVashington and State ofIowa, have invented certain new and useful Improvements inDiskSharpeners, of which the following is a specification.

This invention appertains to machines of the type designed mostespecially for sharpening disks, such as rotary colters and harrow andplow cutters.

An essential feature of the invention is the provision of means wherebydifferent-sized disks may be firmly and securely clamped,interchangeable clamps being provided for the purpose.

A further purpose of the invention is to devise a tool-holder of novelformation which may be instantly shifted to adapt the cutter to the diskand which may be instantly moved so as to clear the disk when it may berequired to inspect the work or after the sharpening process has beencompleted.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand accompanying drawings.

.While the invention maybe adapted to difierent forms and conditions bychanges in the structure and minor details without departing from thespirit or essential features thereof, still the preferred embodiment ofthe invention is shown in the accompanying drawings, in which Figure 1is a perspective view of a disksharpener constructed in accordance withand embodying the essential features of the invention. Fig. 2 isahorizontal section of the upper portion of the machine, parts beingomitted. Fig. 3 is a View similar to Fig. 2 of the machine, showing aplow-disk in position to be sharpened. Fig. 4 is a perspective view ofthe series of clamp members or work-holding devices, the parts beingarranged in a group. Fig. 5 is a detail perspective view of thetool-holder. Fig. 6 is an edge view of a disk, showing the relation ofthe tool and its supporting-standard when applied thereto. Fig. 7 is adetail perspective view of the face side of the clamp member orattachment used in connection with a rolling colter or like disk havinga hub at its concave side. Fig. 8 is a perspective view of the partshown in Fig. 7 as seen from the rear.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The framework for supporting the operating parts of the machine may beof any desired construction and design and, as illus trated, appears asa stand 1, provided at one side with parallel uprights 2, which areconnected at their upper ends. The stand 1 is of pedestal form and isprovided with bearings in which is journaled the power-driven shaft 4,provided with band-pulley 3 and wormthread 5, in mesh with correspondingcogs 6 ofa wormwheel fast upon the shaft 7, which is provided with theclamp devices for holding the work during the sharpening operation. Theshafts 4 and 7 are disposed relatively at a right angle to each other,the arrangement being such as to avoid interference of one with theother.

The work-receiving end of the shaft 7 is provided with a clamp member 8,fast there to and consisting of a disk provided at intervals withprojections 9 to make positive connection either with the disk to besharpened or with a cooperating clamp member 10. The clamp member 10 isprovided upon the side adapted to lie against the clamp member 8 withdepressions 11, corresponding in number and position with theprojections 9, so as to insure positive interlocking connection betweenthe two clamp members when placed together. The outer side of the clampmember 10 is provided with an abrading material, such as sand, emery, orthe like. In preparing the outer face of the member 10 it is firstcoated with an adhesive material, such as glue or paste, after which theabrading material is dusted thereon. The disk 26 to be sharpened, if arolling colter or of such a nature as to have a hub 29 on its hollow orconcave side, is confined between the member 10 and a washer 12, thelatter being forced home by means of a tap-bolt 13, threaded into theend'ofthe shaft 7, provided with the clamp member 8. When the disk issmooth upon its concave face, the member 10 is dispensed with, said diskbeing slipped upon the shaft 7 and clamped between the parts 8 and 12.The member 10 is provided in its outer face with a central depression 28for reception of the hub 29. The roughened face 30 prevents slipping ofthe disk 26 when sharpening.

For disk stirring-plows, as 31, or like large sized rotary cutters, aclamp member 14 is provided. This clamp member 14 is of larger diameterthan the clamp member 8, and one side thereof is provided with a centraldepression 15 of a size to snugly receive the disk 8, and the other sideis provided near its periphery with projections 17 for substantially thesame purpose as the projections 9 of disk 8namely, to prevent slippingof the Work when the machine is in operation. This member 14 supportsdisk 31 near its outer edge.

The tool-holder comprises members 18 and 19, crossed near one end andpivoted at their point of crossing, one member carrying anantifriction-roller 20 and the other member provided with a cutter 21,by means of which the sharpening is effected. A standard 22 is pendentfrom the outer end of one of the pivoted members and is pointed at itslower end to form, in effect, a pivot-support to admit of adapting thecutter to the disk being sharpened. The standard 22 is curved throughoutits length, and this is of vital consequence, as it prevents the cutterfrom wedging against the work and admits of its ready control and easydetachment from the work when required for any purpose. Moreover, thecurvature of the standard 22 enables its foot to obtain a purchase uponthe support 23 at a point to one side of a perpendicular line passedthrough the disk 31, as shown most clearly in Fig. 6. The disk 31occupies a position between perpendicular planes passed through thecutter 21 and the foot of the standard 22. Hence the tendency of thecutter 21 is to fall away from the work instead of being forced towardit, as would be the case if the foot of the standard were on the sameside of the disk as the cutter.

A plate 23 forms the top of the stand and is provided in its upper sidewith a plurality of depressions 24, designed to receive the lowerextremity of the standard 22, so as to prevent slipping thereof afterthe tool-holder has been adjusted to the required position. The plate 23is preferably an integral part of the stand. This is not essential, asit may be separate from and applied to the stand in any manner and maybe of any form.

In the practical operation of the machine the disk 26 to be sharpened isheld either between the clamp member 8 and washer 12 or between themember 10 and the washer 12, as shown in Fig. 2, or between the clampmember 14 or washer 12, as shown in Fig. 3. In either instance thewasher 12 is clamped against the outer side of the disk by means of thetap-bolt 13. The cutter is adapted to the disk by inserting the lowerend of the standard 22 in one of the depressions 24, theantifriction-roller 20 being arranged upon one side of the disk and thecutting-tool 21 upon the opposite side. By proper manipulation of themembers 18 and 19 the cutter 21 may be pressed against the disk with anydegree of force and may be moved to effect proper sharpening as may berequired.

Having thus described the invention,what is claimed as new is- 1. In adisk-sharpener, the combination of a power-driven shaft provided with aclamp member having its outer face provided with a centrally-disposedrecess and with a circular series of spaced projections, a cooperatingclamp member loose upon said shaft and having recesses in its inner faceto receive the projections of the first-mentioned clamp member andprovided in its outer face with a depression to receive the hub of thedisk to be sharpened, and means acting jointly with the said clampmembers for holding them and the work securely.

2. A holder for disk-sharpeners provided with a supporting-standardcurved in its length to admit of the disk to be sharpened occupying aposition between parallel planes passed through respectively, the edgeof the tool and the foot of the standard, whereby the normal tendency ofthe tool is to fall away from the disk.

3. A tool-holder for disk-sharpeners comprising members pivoted betweentheir ends, one of said members having a pressure-roller and the otherprovided with a tool and with an integral standard curved and taperedthroughout its length to a point, the parts be ing arranged to admit ofthe disk to be sharpened occupying a position between parallel planespassed through respectively the edge of the tool and the foot of thestandard, whereby the normal tendency of the tool is to fall away fromthe disk.

In testimony whereof I aflix my signature in presence oftwo witnesses.

CHARLES M. STRAIN.

Witnesses W. S. SEWELL, G120. R. YEAGER.

